The formula to the left is explained as follows: TAS = EAS √ (ρ0 / ρ), where ρ0 = 1,225 kg/m3 at sea level and ρ is the actual air density at your current altitude.
How is indicated airspeed calculated?
Indicated Airspeed
The system uses the difference between the total pressure (measured by the pitot probe) and the static pressure (measured by the static ports) to determine the dynamic pressure which is converted to an airspeed reading.
What is indicated speed?
Indicated airspeed is the speed at which the aircraft is flying as indicated by the airspeed indicator. The private jet speeds are determined either mechanically or electronically using the difference between total pressure and static pressure.
